Thermodynamics (Temperature and Heat)

Temperate

It is a measure of the hotness or coldness of an object

What is another definition for Temperature?

[T] = K

Heat

It is a form or energy that causes a rise in temperature when added or a fall in temperature when withdrawn

What is Heat measured in?

Joules (J)

What is the Definition of the Degree Celsius?

θ (°C) = T (K) - 273.15

Theta = Temperature in Degrees Celsius = Temperature in Kelvins

Establishment of a Temperature Scale

To establish a temperature scale, you need 3 things.

The first thing to establish a temperature scale

A thermometric property. It is a physical property that changes measurably with temperature

Examples of thermometric properties

length of liquid column

emf of thermocouple

pressure of a gas at constant volume

volume of a gas at constant pressure

resistance

colour

Thermocouple

Two junctions of two different metal if held at two different temperatures, will produce emf (electromotive force ie. a voltage)

The second thing you need to establish a temperature scale

2. Two fixed points.

eg. the freezing point of water & the boiling point of water or absolute zero & the triple point of water

The third thing you need to establish a temperature scale

A scale eg. 0 to 100 or 0 to 273.16